The mechanism of polyethylene biodegradation known as Oxo-Biodegrdation involved in two stages: these are
abiotic (photo or thermo) oxidationmicrobial biodegradation.
Initial abiotic oxidation is an important stage as it determines the rate of entire process. In this stage polyethylene is oxidized leading to reduction of its molecular weight significantly. Also hydroxyl (-OH), carbonyl (C=O) and carboxylic (-COOH) groups are introduced into polyethylene chain leading to further oxidation of polyethylene.
The main factors that influence abiotic oxidation are heat and sunlight. They are crucial for both reduction of molecular weight and the production of low molecular weight compounds that can be assimilated easily by the microorganisms.
ENERPLASTICS OXO-BIODEGRADABLE ADDITIVES:
EnerPlastics OBD additives are introduced to plastics films at manufacturing stage; the additives are dosed at very low level which ensures that the commercial product (film) would have a guaranteed mechanical strength and other properties for a minimum period (usually 12months) after manufacturing.
The organometallic constituents should act as a catalyst to oxidizing the polymer molecule to a state when it is no longer a polymer molecule but has been converted to a molecule that is common to the food intake of soil microbes, fungi, bacteria etc.
The metal part of the organometallic component should not be toxic to soil or food contact.
The approach on testing material on degradability
THE APPROACH ON TESTING MATERIAL ON DEGRADABILITY
Standard and Tests
Testing is a critical aspect of supporting an oxo-biodegradable product. EnerPlastics has a state of the art testing laboratory which is capable of performing oxobiodegradable testing and determines the suitability of a formulation for given applications. EnerPlastics has several weathering chambers, FTIR, XRF and tensile to conduct testing.
AFNOR STANDARD ACT 51-808
Plastics: Assessment of oxobiodegradablity of polyolefinic materials in form of films- methodology and requirements. In order to predict long term fate of polymeric material dispersed in environment, it is necessary to establish accelerated laboratory conditions. Studies of polyolefinic time course mechanisms have demonstrated that phenomena governing evolution in a natural environment are photothermal oxidations (under combined effect of light and heat) and thermooxidations. The progress of these oxidations is determined through accumulation of carboxylic acid groups that can be detected using FTIR spectrophotometer. The increase in absorbance at 1714cm-1 which determines the relative acid group contents can be expressed based on thickness of films.
EnerPlastics also provides solutions to help (Blow ) Plastic product's moulders reduce Cycle Times, achieve uniformity in product weight, improve gloss and weather compatibility of their products.Another area pioneered by EnerPlastics is range of Additives dispersed in Polymers that can be widely used in the Film Industry, PP non-woven (Spun bond and melt blown) applications as well as in the PP geotextile and PE artificial grass applications.
The list below provides the customers to select a suitable additive to meet their requirements. For further details on EP Additive masterbatches, contact EP Sales.
EnerPlastics offers a vast range of different kinds of additives that will enhance and reinforce polymers and masterbatch itself in whatever purpose it may serve during application process and in plastics products' end usage.